Stacktrace during startup

During startup there is a stack trace in timesheet job scheduler. Could be an old version left a job, is possible to remove or disable ?
Thanks, Luca
#!

2015-04-23 18:04:12,488 localhost-startStop-1 ERROR      [timesheet.plugin.job.TimesheetJobScheduler] Unexpected error during launch
java.lang.IllegalArgumentException: cronExpression cannot be null
        at org.quartz.CronExpression.<init>(CronExpression.java:250)
        at org.quartz.CronTrigger.setCronExpression(CronTrigger.java:471)
        at org.quartz.CronTrigger.<init>(CronTrigger.java:302)
        at jira.timesheet.plugin.job.TimesheetJobScheduler.schedule(TimesheetJobScheduler.java:90)
        at jira.timesheet.plugin.job.TimesheetJobScheduler.onLifecycleEvent(TimesheetJobScheduler.java:172)
        at jira.timesheet.plugin.job.TimesheetJobScheduler.onStart(TimesheetJobScheduler.java:74)  <+2> (DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
        at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
        at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
        at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
        at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
        at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
        at com.sun.proxy.$Proxy717.onStart(Unknown Source)
        at com.atlassian.sal.core.lifecycle.DefaultLifecycleManager.notifyLifecycleAwareOfStart(DefaultLifecycleManager.java:99)
        at com.atlassian.sal.core.lifecycle.DefaultLifecycleManager.notifyOnStart(DefaultLifecycleManager.java:91)
        at com.atlassian.sal.jira.lifecycle.JiraLifecycleManager.notifyOnStart(JiraLifecycleManager.java:67)
        at com.atlassian.sal.core.lifecycle.DefaultLifecycleManager.start(DefaultLifecycleManager.java:50)
        at com.atlassian.sal.jira.lifecycle.JiraLifecycleManager.onJiraStart(JiraLifecycleManager.java:61)  <+3> (NativeMethodAccessorImpl.java:57) (DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:36)
        at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1$1.run(AsynchronousAbleEventDispatcher.java:46)
        at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:253)
        at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:101)
        at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:160)
        at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:79)
        at com.atlassian.plugin.event.impl.DefaultPluginEventManager.broadcast(DefaultPluginEventManager.java:84)
        at com.atlassian.jira.upgrade.PluginUpgradeLauncher.start(PluginUpgradeLauncher.java:35)
        at com.atlassian.jira.startup.ActiveServicesLauncher.start(ActiveServicesLauncher.java:43)
        at com.atlassian.jira.startup.DefaultJiraLauncher$3.run(DefaultJiraLauncher.java:137)
        at com.atlassian.jira.config.database.DatabaseConfigurationManagerImpl.doNowOrEnqueue(DatabaseConfigurationManagerImpl.java:324)
        at com.atlassian.jira.config.database.DatabaseConfigurationManagerImpl.doNowOrWhenDatabaseActivated(DatabaseConfigurationManagerImpl.java:214)
        at com.atlassian.jira.startup.DefaultJiraLauncher.postDbLaunch(DefaultJiraLauncher.java:118)
        at com.atlassian.jira.startup.DefaultJiraLauncher.access$100(DefaultJiraLauncher.java:32)
        at com.atlassian.jira.startup.DefaultJiraLauncher$1.run(DefaultJiraLauncher.java:81)
        at com.atlassian.jira.util.devspeed.JiraDevSpeedTimer.run(JiraDevSpeedTimer.java:34)
        at com.atlassian.jira.startup.DefaultJiraLauncher.start(DefaultJiraLauncher.java:76)
        at com.atlassian.jira.startup.LauncherContextListener.contextInitialized(LauncherContextListener.java:71)  <+5> (StandardContext.java:4992) (StandardContext.java:5490) (LifecycleBase.java:150) (ContainerBase.java:1575) (ContainerBase.java:1565)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
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